EP 1353454 A3 20051019 - Multi-beam satellite communications system
Title (en)
Multi-beam satellite communications system
Title (de)
Mehrstrahlsatellitenkommunikationssystem
Title (fr)
Système de télécommunications par satellite multi-faisceaux
Publication
Application
Priority
- EP 00968379 A 20000921
- US 15617099 P 19990927
- US 57647500 A 20000523
Abstract (en)
[origin: EP1353454A2] A satellite communications system having ground user terminals, hubs, and a geosynchronous satellite. The satellite generates a network of spot beam coverage areas on the earth. A hub and at least one ground terminal are located in each of at least two spot beams. A first user terminal transmits an uplink signal according to a first signal protocol to the hub through the satellite. A second user terminal receives a downlink signal according to a second signal protocol through the downlink spot beam from the hub through the satellite. The hub may be located in the same spot beam coverage area as the first or the second user terminal or may be located in an altogether different spot beam coverage area. Through selective frequency and/or polarization routing on board the satellite, a hub located within a "parent" beam can communicate with user terminals within the parent beam at a specified frequency and polarization, and can communicate with users in other "dependent" beams on a different frequency and/or polarization. This routing allocates the total available bandwidth between parent and dependent beams. The system enables asynchronous communications between each hub and the satellite to maximize frequency re-use and the overall capacity of the system. <IMAGE>
IPC 1-7
IPC 8 full level
H04B 7/185 (2006.01)
CPC (source: EP)
H04B 7/18584 (2013.01)
Citation (search report)
- [A] EP 0748064 A2 19961211 - GLOBALSTAR LP [US]
- [A] US 4689625 A 19870825 - BARMAT MELVIN [US]
- [A] EP 0883252 A2 19981209 - HUGHES ELECTRONICS CORP [US]
- [A] WO 9943104 A1 19990826 - VIASAT INC [US], et al
- [A] EP 0306918 A2 19890315 - NEC CORP [JP]
- [A] EP 0760561 A2 19970305 - COM DEV LTD [CA]
- [A] GARG S ET AL: "Cost effective personal communications using geo-synchronous satellite", IEEE INTERNATIONAL CONFERENCE ON PERSONAL WIRELESS COMMUNICATIONSPROCEEDINGS,XX,XX, 1996, pages 289 - 293, XP002082547
- [A] MARTIN J N ET AL: "Broadband wireless services from High Altitude Long Operation (HALO) aircraft", PROCEEDINGS OF THE SPIE,US,SPIE, BELLINGHAM, VA, vol. 3232, 5 November 1997 (1997-11-05), pages 9 - 20, XP002093950
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 03016070 A 20000921